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Voltage Control : 58 phrases in 13 subjects |
| Automated equipment | 10 |
| Construction | 2 |
| Earth sciences | 1 |
| Electric traction | 2 |
| Electrical engineering | 1 |
| Electricity generation | 1 |
| Electronics | 8 |
| General | 5 |
| Measuring instruments | 7 |
| Mechanic engineering | 1 |
| Medical | 1 |
| Technology | 15 |
| Transport | 4 |